Individuals with cancer must overcome multiple, ongoing challenges ("self-advocate") related to their cancer experience to receive patient-centered care. Women with metastatic cancer often face significant challenges managing their quality of life concerns and cancer- and treatment-related symptoms. If they do not self-advocate to manage these concerns, they risk having poor quality of life, high symptom burden, and care that is not patient-centered. Serious games (video games that teach) are effective health interventions that allow users to vicariously engage in situations reflecting their personal experiences, receive meaningful information, and learn personally relevant skills that they can apply in real life. The goal of the current study is to test the efficacy of a novel intervention using a serious game platform to teach self-advocacy skills to women with advanced cancer. The Strong Together intervention consists of a multi-session, interactive serious game application with tailored self-advocacy goal-setting and training. The serious game is based on a self-advocacy conceptual framework and applies behavior change theories and serious game mechanisms to promote skill development and implementation. The game works by immersing users in the experiences of characters who are women with advanced cancer; requiring users to make decisions about how the characters self-advocate; demonstrating the positive and negative consequences of self-advocating or not, respectively; and providing multiple, individualized feedback mechanisms and game features to enforce self-advocacy skill acquisition and transference to real life.